' List Antecedent Services for a Single Service
strComputer = "."
Set objWMIService = GetObject("winmgmts:" _
& "{impersonationLevel=impersonate}!\\" & strComputer & "\root\cimv2")
Set colServiceList = objWMIService.ExecQuery("Associators of " _
& "{Win32_service.Name='SMTPSVC'} Where " _
& "AssocClass=Win32_DependentService " & "Role=Dependent")
For Each objService in colServiceList
Wscript.Echo objService.DisplayName
Next